LM341/LM78MXX Series
3-Terminal Positive Voltage Regulators
General Description
The LM341 and LM78MXX series of three-terminal positive
voltage regulators employ built-in current limiting, thermal
shutdown, and safe-operating area protection which makes
them virtually immune to damage from output overloads.
With adequate heatsinking, they can deliver in excess of
0.5A output current. Typical applications would include local
(on-card) regulators which can eliminate the noise and de-
graded performance associated with single-point regulation.
Features
nOutput current in excess of 0.5A
nNo external components
nInternal thermal overload protection
nInternal short circuit current-limiting
nOutput transistor safe-area compensation
nAvailable in TO-220, TO-39, and TO-252 D-PAK
packages
nOutput voltages of 5V, 12V, and 15V
Connection Diagrams
TO-39 Metal Can Package (H)
DS010484-5
Bottom View
Order Number LM78M05CH, LM78M12CH or LM78M15CH
See NS Package Number H03A
TO-220 Power Package (T)
DS010484-6
Top View
Order Number LM341T-5.0, LM341T-12, LM341T-15, LM78M05CT, LM78M12CT or LM78M15CT
See NS Package Number T03B
TO-252
DS010484-19
Top View
Order Number LM78M05CDT
See NS Package Number TD03B
July 1999
LM341/LM78MXX Series 3-Terminal Positive Voltage Regulators
© 1999 National Semiconductor Corporation DS010484 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Lead Temperature (Soldering, 10 seconds)
TO-39 Package (H) 300˚C
TO-220 Package (T) 260˚C
Storage Temperature Range −65˚C to +150˚C
Operating Junction Temperature
Range −40˚C to +125˚C
Power Dissipation (Note 2) Internally Limited
Input Voltage
5V ≤V
O
≤15V 35V
ESD Susceptibility TBD
Electrical Characteristics
Limits in standard typeface are for T
J
=25˚C, and limits in boldface type apply over the −40˚C to +125˚C operating temperature
range. Limits are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC)
methods.
LM341-5.0, LM78M05C
Unless otherwise specified: V
IN
=10V, C
IN
=0.33 µF, C
O
=0.1 µF
Symbol Parameter Conditions Min Typ Max Units
V
O
Output Voltage I
L
=500 mA 4.8 5.0 5.2 V
5mA≤I
L
≤500 mA 4.75 5.0 5.25
P
D
≤7.5W, 7.5V ≤V
IN
≤20V
V
R LINE
Line Regulation 7.2V ≤V
IN
≤25V I
L
=100 mA 50 mV
I
L
=500 mA 100
V
R LOAD
Load Regulation 5 mA ≤I
L
≤500 mA 100
I
Q
Quiescent Current I
L
=500 mA 4 10.0 mA
∆I
Q
Quiescent Current Change 5 mA ≤I
L
≤500 mA 0.5
7.5V ≤V
IN
≤25V, I
L
=500 mA 1.0
V
n
Output Noise Voltage f =10 Hz to 100 kHz 40 µV
Ripple Rejection f =120 Hz, I
L
=500 mA 78 dB
V
IN
Input Voltage Required I
L
=500 mA 7.2 V
to Maintain Line Regulation
∆V
O
Long Term Stability I
L
=500 mA 20 mV/khrs
www.national.com 2
Electrical Characteristics
Limits in standard typeface are for T
J
=25˚C, and limits in boldface type apply over the −40˚C to +125˚C operating temperature
range. Limits are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC)
methods. (Continued)
LM341-12, LM78M12C
Unless otherwise specified: V
IN
=19V, C
IN
=0.33 µF, C
O
=0.1 µF
Symbol Parameter Conditions Min Typ Max Units
V
O
Output Voltage I
L
=500 mA 11.5 12 12.5 V
5mA≤I
L
≤500 mA 11.4 12 12.6
P
D
≤7.5W, 14.8V ≤V
IN
≤27V
V
R LINE
Line Regulation 14.5V ≤V
IN
≤30V I
L
=100 mA 120 mV
I
L
=500 mA 240
V
R LOAD
Load Regulation 5 mA ≤I
L
≤500 mA 240
I
Q
Quiescent Current I
L
=500 mA 4 10.0 mA
∆I
Q
Quiescent Current Change 5 mA ≤I
L
≤500 mA 0.5
14.8V ≤V
IN
≤30V, I
L
=500 mA 1.0
V
n
Output Noise Voltage f =10 Hz to 100 kHz 75 µV
Ripple Rejection f =120 Hz, I
L
=500 mA 71 dB
V
IN
Input Voltage Required I
L
=500 mA 14.5 V
to Maintain Line Regulation
∆V
O
Long Term Stability I
L
=500 mA 48 mV/khrs
LM341-15, LM78M15C
Unless otherwise specified: V
IN
=23V, C
IN
=0.33 µF, C
O
=0.1 µF
Symbol Parameter Conditions Min Typ Max Units
V
O
Output Voltage I
L
=500 mA 14.4 15 15.6 V
5mA≤I
L
≤500 mA 14.25 15 15.75
P
D
≤7.5W, 18V ≤V
IN
≤30V
V
R LINE
Line Regulation 17.6V ≤V
IN
≤30V I
L
=100 mA 150 mV
I
L
=500 mA 300
V
R LOAD
Load Regulation 5 mA ≤I
L
≤500 mA 300
I
Q
Quiescent Current I
L
=500 mA 4 10.0 mA
∆I
Q
Quiescent Current Change 5 mA ≤I
L
≤500 mA 0.5
18V ≤V
IN
≤30V, I
L
=500 mA 1.0
V
n
Output Noise Voltage f =10 Hz to 100 kHz 90 µV
Ripple Rejection f =120 Hz, I
L
=500 mA 69 dB
V
IN
Input Voltage Required I
L
=500 mA 17.6 V
to Maintain Line Regulation
∆V
O
Long Term Stability I
L
=500 mA 60 mV/khrs
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-
vice outside of its rated operating conditions.
Note 2: The typical thermal resistance of the three package types is:
T(TO-220) package: θ(JA) =60 ˚C/W, θ(JC) =5 ˚C/W
H(TO-39) package: θ(JA) =120 ˚C/W, θ(JC) =18 ˚C/W
DT (TO-252) package: θ(JA) =92 ˚C/W, θ(JC) =10 ˚C/W
www.national.com3
Schematic Diagram
DS010484-1
www.national.com 4
Typical Performance Characteristics
Peak Output Current
DS010484-10
Ripple Rejection
DS010484-11
Ripple Rejection
DS010484-12
Dropout Voltage
DS010484-13
Output Voltage (Normalized
to 1V at T
J
=25˚C)
DS010484-14
Quiescent Current
DS010484-15
www.national.com5
Typical Performance Characteristics (Continued)
Design Considerations
The LM78MXX/LM341XX fixed voltage regulator series has
built-in thermal overload protection which prevents the de-
vice from being damaged due to excessive junction tem-
perature.
The regulators also contain internal short-circuit protection
which limits the maximum output current, and safe-area pro-
tection for the pass transistor which reduces the short-circuit
current as the voltage across the pass transistor is in-
creased.
Although the internal power dissipation is automatically lim-
ited, the maximum junction temperature of the device must
be kept below +125˚C in order to meet data sheet specifica-
tions. An adequate heatsink should be provided to assure
this limit is not exceeded under worst-case operating condi-
tions (maximum input voltage and load current) if reliable
performance is to be obtained).
1.0 Heatsink Considerations
When an integrated circuit operates with appreciable cur-
rent, its junction temperature is elevated. It is important to
quantify its thermal limits in order to achieve acceptable per-
formance and reliability. This limit is determined by summing
the individual parts consisting of a series of temperature
rises from the semiconductor junction to the operating envi-
ronment. A one-dimension steady-state model of conduction
heat transfer is demonstrated in The heat generated at the
device junction flows through the die to the die attach pad,
through the lead frame to the surrounding case material, to
the printed circuit board, and eventually to the ambient envi-
ronment. Below is a list of variables that may affect the ther-
mal resistance and in turn the need for a heatsink.
R
θJC
(Component Variables) R
θCA
(Application Variables)
Leadframe Size & Material Mounting Pad Size, Material,
& Location
No. of Conduction Pins Placement of Mounting Pad
Die Size PCB Size & Material
Die Attach Material Traces Length & Width
Molding Compound Size and
Material Adjacent Heat Sources
Volume of Air
Air Flow
Ambient Temperature
Shape of Mounting Pad
Quiescent Current
DS010484-16
Output Impedance
DS010484-17
Line Transient Response
DS010484-7
Load Transient Response
DS010484-8
www.national.com 6
Design Considerations (Continued)
The LM78MXX/LM341XX regulators have internal thermal
shutdown to protect the device from over-heating. Under all
possible operating conditions, the junction temperature of
the LM78MXX/LM341XX must be within the range of 0˚C to
125˚C. A heatsink may be required depending on the maxi-
mum power dissipation and maximum ambient temperature
of the application. To determine if a heatsink is needed, the
power dissipated by the regulator, P
D
, must be calculated:
I
IN
=I
L
+I
G
P
D
=(V
IN
−V
OUT
)I
L
+V
IN
I
G
shows the voltages and currents which are present in the
circuit.
The next parameter which must be calculated is the maxi-
mum allowable temperature rise, T
R
(max):
θ
JA
=TR (max)/P
D
If the maximum allowable value for θ
JA
˚C/w is found to be
≥60˚C/W for TO-220 package or ≥92˚C/W for TO-252 pack-
age, no heatsink is needed since the package alone will dis-
sipate enough heat to satisfy these requirements. If the cal-
culated value for θ
JA
fall below these limits, a heatsink is
required.
As a design aid,
Table 1
shows the value of the θ
JA
of
TO-252 for different heatsink area. The copper patterns that
we used to measure these θ
JA
are shown at the end of the
Application Note Section. reflects the same test results as
what are in the
Table 1
shows the maximum allowable power dissipation vs. ambi-
ent temperature for theTO-252 device. shows the maximum
allowable power dissipation vs. copper area (in
2
) for the
TO-252 device. Please seeAN1028 for power enhancement
techniques to be used with TO-252 package.
TABLE 1. θ
JA
Different Heatsink Area
Layout Copper Area Thermal Resistance
Top Sice (in
2
)* Bottom Side (in
2
)(θ
JA
, ˚C/W) TO-252
1 0.0123 0 103
2 0.066 0 87
3 0.3 0 60
4 0.53 0 54
5 0.76 0 52
61047
7 0 0.2 84
8 0 0.4 70
9 0 0.6 63
10 0 0.8 57
11 0 1 57
12 0.066 0.066 89
13 0.175 0.175 72
14 0.284 0.284 61
15 0.392 0.392 55
16 0.5 0.5 53
*Tab of device attached to topside copper
DS010484-23
FIGURE 1. Cross-sectional view of Integrated Circuit
Mounted on a printed circuit board. Note that the case
temperature is measured at the point where the leads
contact with the mounting pad surface
DS010484-24
FIGURE 2. Power Dissipation Diagram
www.national.com7
Design Considerations (Continued)
Typical Application
DS010484-20
FIGURE 3. θ
JA
vs. 2oz Copper Area for TO-252
DS010484-22
FIGURE 4. Maximum Allowable Power Dissipation vs.
Ambient Temperature for TO-252
DS010484-21
FIGURE 5. Maximum Allowable Power Dissipation vs.
2oz. Copper Area for TO-252
DS010484-9
*Required if regulator input is more than 4 inches from input filter capacitor
(or if no input filter capacitor is used).
**Optional for improved transient response.
www.national.com 8
Physical Dimensions inches (millimeters) unless otherwise noted
TO-39 Metal Can Package (H)
Order Number LM78M05CH, LM78M12CH or LM78M15CH
NS Package Number H03A
www.national.com9
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-220 Power Package (T)
Order Number LM341T-5.0, LM341T-12, LM341T-15, LM78M05CT, LM78M12CT or LM78M15CT
NS Package Number T03B
www.national.com 10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
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www.national.com
TO-252
Order Number LM78M05CDT
NS Package Number TD03B
LM341/LM78MXX Series 3-Terminal Positive Voltage Regulators
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
National P/N LM78M12 - 3-Terminal Positive Voltage Regulators
See Wireless Products
Products > Analog - Regulators > Linear Regulators - Standard/NPN > Positive Voltage - Fixed > LM78M12
LM78M12 Product Folder
3-Terminal Positive Voltage Regulators
Generic P/N 78M12
General
Description Features Datasheet Package
& Models Samples
& Pricing
Parametric Table Parametric Table
Multiple Output Capability No
On/Off Pin No
Error Flag -
Input Voltage, min (Volt) 14.50
Input Voltage, max (Volt) 35
Output Current, max 500 mA
Watchdog -
Output Voltage (Volt) 12
Datasheet
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LM341 LM78MXX Series 3-Terminal
Positive Voltage Regulators 310 Kbytes 7-Jul-99 View Online Download Receive via Email
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General Description
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National P/N LM78M12 - 3-Terminal Positive Voltage Regulators
The LM341 and LM78MXX series of three-terminal positive voltage regulators employ built-in current limiting,
thermal shutdown, and safe-operating area protection which makes them virtually immune to damage from
output overloads.
With adequate heatsinking, they can deliver in excess of 0.5A output current. Typical applications would
include local (on-card) regulators which can eliminate the noise and degraded performance associated with
single-point regulation.
Features
● Output current in excess of 0.5A
● No external components
● Internal thermal overload protection
● Internal short circuit current-limiting
● Output transistor safe-area compensation
● Available in TO-220, TO-39, and TO-252 D-PAK packages
● Output voltages of 5V, 12V, and 15V
[Information as of 5-Aug-2002]
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National P/N LM78M05 - 3-Terminal Positive Voltage Regulators
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Products > Analog - Regulators > Linear Regulators - Standard/NPN > Positive Voltage - Fixed > LM78M05
LM78M05 Product Folder
3-Terminal Positive Voltage Regulators
Generic P/N 78M05
General
Description Features Datasheet Package
& Models Samples
& Pricing
Parametric Table Parametric Table
Multiple Output Capability No
On/Off Pin No
Error Flag -
Input Voltage, min (Volt) 7.20
Input Voltage, max (Volt) 35
Output Current, max 500 mA
Watchdog -
Output Voltage (Volt) 5
Datasheet
Title Size in Kbytes Date View Online Download Receive via Email
LM341 LM78MXX Series 3-Terminal
Positive Voltage Regulators 310 Kbytes 7-Jul-99 View Online Download Receive via Email
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each
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production N/A N/A
24 Hour
Samples
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National P/N LM78M05 - 3-Terminal Positive Voltage Regulators
LM78M05C MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
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production N/A N/A
wafer
jar
of
N/A
-
General Description
The LM341 and LM78MXX series of three-terminal positive voltage regulators employ built-in current limiting,
thermal shutdown, and safe-operating area protection which makes them virtually immune to damage from
output overloads.
With adequate heatsinking, they can deliver in excess of 0.5A output current. Typical applications would
include local (on-card) regulators which can eliminate the noise and degraded performance associated with
single-point regulation.
Features
● Output current in excess of 0.5A
● No external components
● Internal thermal overload protection
● Internal short circuit current-limiting
● Output transistor safe-area compensation
● Available in TO-220, TO-39, and TO-252 D-PAK packages
● Output voltages of 5V, 12V, and 15V
[Information as of 5-Aug-2002]
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Products
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3-Terminal Positive Voltage Regulators
Generic P/N 341
General
Description Features Datasheet Package
& Models Samples
& Pricing
Parametric Table Parametric Table
Multiple Output Capability No
On/Off Pin No
Error Flag -
Input Voltage, min (Volt) 14.50, 17.60, 7.20
Input Voltage, max (Volt) 35
Output Current, max 500 mA
Watchdog -
Output Voltage (Volt) 12, 15, 5
Datasheet
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Positive Voltage Regulators 310 Kbytes 7-Jul-99 View Online Download Receive via Email
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National P/N LM341 - 3-Terminal Positive Voltage Regulators
LM341-5.0
MDC Die Full production N/A N/A
Samples
tray
of
N/A -
LM341-12
MWC Wafer Full production N/A N/A
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of
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LM341-15
MWC Wafer Full production N/A N/A
wafer
jar
of
N/A
-
LM341-5.0
MWC Wafer Full production N/A N/A
wafer
jar
of
N/A
-
General Description
The LM341 and LM78MXX series of three-terminal positive voltage regulators employ built-in current limiting,
thermal shutdown, and safe-operating area protection which makes them virtually immune to damage from
output overloads.
With adequate heatsinking, they can deliver in excess of 0.5A output current. Typical applications would
include local (on-card) regulators which can eliminate the noise and degraded performance associated with
single-point regulation.
Features
● Output current in excess of 0.5A
● No external components
● Internal thermal overload protection
● Internal short circuit current-limiting
● Output transistor safe-area compensation
● Available in TO-220, TO-39, and TO-252 D-PAK packages
● Output voltages of 5V, 12V, and 15V
[Information as of 5-Aug-2002]
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Contact Us . Site Terms & Conditions of Use . Copyright 2002 © National Semiconductor Corporation . My Preferences .
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National P/N LM78M15 - 3-Terminal Positive Voltage Regulators
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Products > Analog - Regulators > Linear Regulators - Standard/NPN > Positive Voltage - Fixed > LM78M15
LM78M15 Product Folder
3-Terminal Positive Voltage Regulators
Generic P/N 78M15
General
Description Features Datasheet Package
& Models Samples
& Pricing
Parametric Table Parametric Table
Multiple Output Capability No
On/Off Pin No
Error Flag -
Input Voltage, min (Volt) 17.60
Input Voltage, max (Volt) 35
Output Current, max 500 mA
Watchdog -
Output Voltage (Volt) 15
Datasheet
Title Size in Kbytes Date View Online Download Receive via Email
LM341 LM78MXX Series 3-Terminal
Positive Voltage Regulators 310 Kbytes 7-Jul-99 View Online Download Receive via Email
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Type Pins MSL SPICE IBIS Qty $US each
LM78M15CT TO
220 3MSL Full
production N/A N/A
Buy Now
1K+ $0.1900 rail
of
45
[logo]¢U¢Z¢2¢T
LM341T-15
LM78M15CT
LM78M15CH TO-39 3MSL Full
production N/A N/A
Buy Now
1K+ $1.2800 bag
of
500
[logo]¢Z¢2¢T
LM78M15CH
LM78M15 MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
LM78M15 MWC Wafer Full
production N/A N/A
wafer
jar
of
N/A
-
General Description
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LM78M15.html (1 of 2) [09-Aug-2002 12:18:07 PM]
National P/N LM78M15 - 3-Terminal Positive Voltage Regulators
The LM341 and LM78MXX series of three-terminal positive voltage regulators employ built-in current limiting,
thermal shutdown, and safe-operating area protection which makes them virtually immune to damage from
output overloads.
With adequate heatsinking, they can deliver in excess of 0.5A output current. Typical applications would
include local (on-card) regulators which can eliminate the noise and degraded performance associated with
single-point regulation.
Features
● Output current in excess of 0.5A
● No external components
● Internal thermal overload protection
● Internal short circuit current-limiting
● Output transistor safe-area compensation
● Available in TO-220, TO-39, and TO-252 D-PAK packages
● Output voltages of 5V, 12V, and 15V
[Information as of 5-Aug-2002]
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